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Volumn 121, Issue 36, 1999, Pages 8146-8156

Exciton and charge-transfer interactions in nonconjugated merocyanine dye dimers: Novel solvatochromic behavior for tethered bichromophores and excimers

Author keywords

[No Author keywords available]

Indexed keywords

DIMER; DYE; MEROCYANINE; MONOMER; SOLVENT;

EID: 0033568226     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja983778h     Document Type: Article
Times cited : (77)

References (31)
  • 10
    • 0001666167 scopus 로고
    • Shin, D. M.; Whitten, D. G. J. Phys. Chem. 1988, 92, 2945. Schanze, K. S.; Mattox, T. F.; D. M.; Whitten, D. G. J. Org. Chem. 1983, 48, 2808.
    • (1988) J. Phys. Chem. , vol.92 , pp. 2945
    • Shin, D.M.1    Whitten, D.G.2
  • 16
    • 0345423399 scopus 로고    scopus 로고
    • note
    • There is also a shoulder on the short-wavelength side of the more intense "red" band which resembles the shoulder observed for dilute solutions of the monomer. None of the spectra shown in Figures 5-7 are concentration-dependent.
  • 17
    • 0344992266 scopus 로고    scopus 로고
    • note
    • We expect, in a "well folded" cofacial structure, that the excitonic splitting (allowed-forbidden character) may be more pronounced than in the somewhat bent structures.
  • 18
    • 0005714052 scopus 로고
    • Birks, J. B. Nature 1967, 214, 1187.
    • (1967) Nature , vol.214 , pp. 1187
    • Birks, J.B.1
  • 20
    • 0003024205 scopus 로고
    • As suggested by a reviewer, a "TICT" state could be involved in such isomerization processes. Previous papers have reported evidence for twisted excited states as intermediates in merocyanine isomerization (e.g.: Harriman, A. J. Photochem. Photobiol. A: Chem. 1992, 65, 79).
    • (1992) J. Photochem. Photobiol. A: Chem. , vol.65 , pp. 79
    • Harriman, A.1
  • 22
    • 0344129700 scopus 로고    scopus 로고
    • note
    • For the merocyanine dimers, several folded configurations are possible. MC simulations indicate an edge-to-face configuration is one minimum. Two limiting face-to-face configurations (one with the chomophores aligned parallel and one with them antiparallel) are possible and reasonable on energetic grounds. It is not possible to determine which configuration or configurations may exists for either the ground or the excited (excimer) state. For purposes of illustration, we assume a "parallel" folded arrangement.
  • 23
    • 0345423398 scopus 로고    scopus 로고
    • note
    • If the configuration results in strong face-face or edge-edge interactions, we may anticipate that the difference between the "allowed" (short wavelength) and "forbidden" components of the split bands may be very great. Thus, for example, with the intermolecular "H" aggregates of squaraines, we are able only to detect the short-wavelength band in absorption, while for corresponding aggregates of stilbenes, only the short-wavelength transition is readily observable in absorption but emission clearly originates from a "hidden" lower energy "forbidden" state.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.